KR870008199A - Optical Fiber Devices and Methods for Spectral Analysis and Filtering - Google Patents

Optical Fiber Devices and Methods for Spectral Analysis and Filtering Download PDF

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Publication number
KR870008199A
KR870008199A KR870001320A KR870001320A KR870008199A KR 870008199 A KR870008199 A KR 870008199A KR 870001320 A KR870001320 A KR 870001320A KR 870001320 A KR870001320 A KR 870001320A KR 870008199 A KR870008199 A KR 870008199A
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optical
optical fiber
signal
output
acoustic
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KR870001320A
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Korean (ko)
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피. 리스크 윌리엄.
에스. 키노 고든
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원본미기재
더 보드 오브 트러스티스 오브 더 리랜드 스탠포드 쥬니어 유니버시티
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Publication of KR870008199A publication Critical patent/KR870008199A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29302—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means based on birefringence or polarisation, e.g. wavelength dependent birefringence, polarisation interferometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/447—Polarisation spectrometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/105—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type having optical polarisation effects
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0128—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on electro-mechanical, magneto-mechanical, elasto-optic effects
    • G02F1/0131—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on electro-mechanical, magneto-mechanical, elasto-optic effects based on photo-elastic effects, e.g. mechanically induced birefringence
    • G02F1/0134—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on electro-mechanical, magneto-mechanical, elasto-optic effects based on photo-elastic effects, e.g. mechanically induced birefringence in optical waveguides
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/12—Generating the spectrum; Monochromators
    • G01J3/1256—Generating the spectrum; Monochromators using acousto-optic tunable filter
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
    • G02B6/2713—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters cascade of polarisation selective or adjusting operations
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2726—Optical coupling means with polarisation selective and adjusting means in or on light guides, e.g. polarisation means assembled in a light guide
    • G02B6/274—Optical coupling means with polarisation selective and adjusting means in or on light guides, e.g. polarisation means assembled in a light guide based on light guide birefringence, e.g. due to coupling between light guides
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
    • G02B6/2766—Manipulating the plane of polarisation from one input polarisation to another output polarisation, e.g. polarisation rotators, linear to circular polarisation converters

Abstract

내용 없음No content

Description

스펙트럼 분석 및 휠터링용 광학 섬유 장치 및 방법Optical Fiber Devices and Methods for Spectral Analysis and Filtering

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제 2 도는 광학 섬유의 편광 모우드들 사이를 결합시키도록 광학섬유 내에 선택적으로 응력을 받은 영역 및 응력을 받지 않은 영역을 발생시키기 위한 릿지(ridge) 구조를 구성하는 편광 결합기를 개략적으로 도시한 부분 정면도,2 is a partial front view schematically showing a polarization combiner constituting a ridge structure for generating selectively stressed and unstressed areas within the optical fiber to couple between polarization modes of the optical fiber; Degree,

제 7 도는 본 발명의 양호한 실시예의 사시도.7 is a perspective view of a preferred embodiment of the present invention.

제15도는 짧은 음향 전달 길이를 제공하면서 광학 섬유와 음파사이의 상호작용 길이를 증가시키기 위해 원통형 음향기질 주위에 광학 섬유가 감겨지는 본 발명의 광학섬유 및 음향 전달 매체의 선택적인 실시예를 도시한 도면.FIG. 15 illustrates an alternative embodiment of the optical fiber and acoustic transmission medium of the present invention in which optical fibers are wound around a cylindrical acoustic substrate to increase the length of interaction between the optical fiber and sound waves while providing a short acoustic transmission length. drawing.

Claims (14)

제 1 및 제 2 광학 전달모우드와 광학 섬유내의 광학신호의 파장에 따라 변하는 상기모우드에 대한 광학 비트 길이를 갖고 있고 제 1 광학 전달 모우드내에서 입력 광학 신호를 수신하기 위한 입력부를 갖고 있고 제 1 전달 모우드내에서 출력광학 신호를 전송하기 위한 출력부를 갖고 있는 광학 섬유, 음파를 발생시키는 변환기, 및 광학 섬유의 입력부와 출력부 사이로 광한 섬유를 따라 종방향으로 음파를 전달하는 음향매체로 구성되고, 음파가 제 1 광학 전달 모우드 내의 입력광학 신호의 광학 에너지의 최소한 일부를 출력 신호를 형성 하도록 제 2광학 전달 모우드에 결합시키게 하는 장치에 있어서, 출력 신호의 세기가 음파의 파장에 따라 변하도록 입력광학 신호용 광학 섬유의 비트 길이와 동일한 파장을 포함하는 파장의 범위를 통해 음파의 파장이 변하도록 변환기를 구동시키는 선택적으로 가변할 수 있는 주파수를 갖고 있는 전기적인 에너지 소오스를 포함함으로써, 입력 신호의 스펙트럼 분석 및 동조가능한 휠터링을 가능하게 하는 것을 특징으로 하는 장치.A first transmission having an optical bit length for the mode that varies with the wavelength of the optical signal in the first and second optical transmission modes and the optical fiber and having an input for receiving an input optical signal within the first optical transmission mode Consists of an optical fiber having an output for transmitting an output optical signal in a mode, a transducer for generating sound waves, and an acoustic medium for transmitting sound waves longitudinally along the optical fiber between the input and output of the optical fiber, A device for coupling at least a portion of the optical energy of an input optical signal in a first optical transmission mode to a second optical transmission mode to form an output signal, wherein the intensity of the output signal varies with the wavelength of the sound wave. Wavelength of sound waves through a range of wavelengths that includes a wavelength equal to the bit length of the optical fiber And an electrical energy source having an optionally variable frequency that drives the transducer to vary, thereby enabling spectral analysis and tunable filtering of the input signal. 제 1 항에 있어서, 광학 섬유의 출력부로부터 광선을 수신하도록 배치된 입력을 갖고 있고 제 2 전달 모우드내에서 광선을 배타적으로 전송하기 위한 출력을 갖고 있는 편광기, 및 편광기로부터 출력되는 광선을 수신하고 편광기로부터 출력되는 광선의 세기에 비례하는 크기를 갖고 있는 출력 전기 신호를 발생시키는 광검출기를 부수적으로 특징으로 하는 장치.2. The polarizer of claim 1, further comprising: a polarizer having an input arranged to receive light rays from an output of the optical fiber and having an output for exclusively transmitting light rays within the second transmission mode, and receiving light rays output from the polarizer and And a photodetector which additionally generates an output electrical signal having a magnitude proportional to the intensity of the light output from the polarizer. 제 1 항 또는 제 2 항에 있어서, 광학 섬유가 단일 모우드 복굴절성 광학 섬유이고, 제 1 및 제 2 광학 전달모우드가 복굴절성 광학 섬유의 제 1 및 제 2 전달 모우드인 것을 특징으로 하는 장치.The device of claim 1 or 2, wherein the optical fiber is a single mode birefringent optical fiber and the first and second optical transmission modes are the first and second transmission modes of the birefringent optical fiber. 제 1 항 내지 제 3 항중 어느 한 항에 있어서, 음향 매체가 광학 섬유에 근접한 영역에 음파의 음향에너지를 한정시키기 위한 음향 도파관을 갖고 있는 기질로 구성되는 것을 특징으로 하는 장치.4. An apparatus according to any one of claims 1 to 3, wherein the acoustic medium consists of a substrate having an acoustic waveguide for confining acoustic energy of sound waves in a region proximate the optical fiber. 제 4 항에 있어서, 도파관이 기질 물질의 음향 전달속도보다 적은 음향 전달 속도를 갖고 있는 음향 채널을 형성하는 음향 물질의 박막으로 구성되는 것을 특징으로 하는 장치.5. An apparatus according to claim 4, wherein the waveguide consists of a thin film of acoustic material forming an acoustic channel having an acoustic propagation rate less than that of the substrate material. 제 5 항에 있어서, 박막이 금속 물질로 구성되는 것을 특징으로 하는 장치.6. The apparatus of claim 5 wherein the thin film is comprised of a metallic material. 제 5 항 또는 제 6 항에 있어서, 박막이 광학 섬유의 직경의 10 내지 25배의 범위내에 있는 폭을 갖고있는 것을 특징으로 하는 장치.The device according to claim 5 or 6, wherein the thin film has a width within a range of 10 to 25 times the diameter of the optical fiber. 제 1 항 내지 제 7 항 중 어느 한 항에 있어서, 입력 신호의 주파수 내용을 나타내기 위해 음향 파장의 함수로서 출력 신호의 세기를 측정하는 검출 장치를 부수적으로 하는 장치.8. Apparatus according to any one of the preceding claims, further comprising a detection device for measuring the intensity of the output signal as a function of the acoustic wavelength to indicate the frequency content of the input signal. 제 1 항 내지 제 8 항중 어느 한 항에 있어서, 입력 신호가 제 1 스펙트럼 대역폭을 갖고 있고, 출력 신호가 제 1 스펙트럼 대역 폭보다 상당히 좁은 제 2스펙트럼 대역폭을 갖고 있으므로, 입력 신호가 휠터되고, 제 2스펙트럼 대역폭의 중심 주파수가 중심주파수를 변화시키도록 전기 에너지 소오스의 주파수의 진동에 응답하므로, 입력 신호의 휠터링을 동조하는 것을 특징으로 하는 장치The input signal according to any one of claims 1 to 8, wherein the input signal has a first spectral bandwidth and the output signal has a second spectral bandwidth considerably narrower than the first spectral bandwidth, so that the input signal is filtered, A device characterized in that it tunes the filtering of the input signal since the center frequency of the two-spectrum bandwidth responds to the vibration of the frequency of the electrical energy source to change the center frequency. 제 1 항 내지 제 9 항중 어느 한 항에 있어서, 음향 매질이 광학섬유의 최소한 약 100비트 길이를 통해 광학 섬유와 음향적으로 접촉하는 것을 특징으로 하는 장치.10. The device of any one of the preceding claims, wherein the acoustic medium is in acoustical contact with the optical fiber through at least about 100 bits in length of the optical fiber. 제 1 항 내지 제10항중 어느 한 항에 있어서, 광학 섬유의 비트 길이의 수가 입력 신호의 비트길이가 음향 파장과 거의 동일할 때 제 1 모우드로부터 제 2 모우드로 광선을 거의 100％ 결합시키도록 선택되는 것을 특징으로 하는 장치.11. A method according to any of the preceding claims, wherein the optical fiber is selected to couple nearly 100% of the light beam from the first mode to the second mode when the number of bit lengths of the optical fiber is approximately equal to the acoustic wavelength. Apparatus characterized in that the. 2개의 전달 모우드를 갖고 있는 광학 섬유내로 광학 신호를 입력시키는 수단, 2개의 모우드들 사이에 광선을 결합시키기 위해 광학 섬유에 주기적 응력을 인가하는 수단, 주기적 응력의 주기성을 변화시키는 수단, 및 주기적 응력의 주기성이 변할 때 2개의 모우드 사이의 광선의 결합을 측정하는 수단을 포함하는 것을 특징으로 하는 스펙트럼 분석 및 휠터링 방법.Means for inputting an optical signal into an optical fiber having two transmission modes, means for applying periodic stress to the optical fiber to couple light rays between the two modes, means for changing the periodicity of the periodic stress, and periodic stress And means for measuring the binding of light rays between two modes when the periodicity of is changed. 제12항에 있어서, 광학 신호가 미지의 파장을 갖고있고, 상기 측정 수단이 광학 신호의 주파수 내용을 결정하기 위해 주기적인 응력의 주파수의 함수로서 결합된 광선의 양을 측정하는 수단을 포함하는 것을 특징으로 하는 방법.13. The method of claim 12, wherein the optical signal has an unknown wavelength and the measuring means comprises means for measuring the amount of combined light as a function of the frequency of periodic stresses to determine the frequency content of the optical signal. How to feature. 제12항에 있어서, 광학 신호가 제 1 광학 스펙트럼을 갖고 있고 결합된 광선이 제 1 광학 스펙트럼보다 상당히 좁은 제 2 광학 스펙트럼을 갖고 있으며 제 2 광학 스펙트럼의 중심 주파수가 주기적 응력의 주기성에 응답하고, 제 2 광학 스펙트럼의 중심 주파수가 바람직한 주파수에 있다는 것을 측정 수단이 표시할때까지 변화 수단을 실행하는 수단을 부수적으로 포함하는 것을 특징으로 하는 방법.13. The method of claim 12, wherein the optical signal has a first optical spectrum and the combined ray has a second optical spectrum that is considerably narrower than the first optical spectrum and the center frequency of the second optical spectrum is responsive to the periodicity of the cyclic stress, And additionally means for executing the changing means until the measuring means indicates that the center frequency of the second optical spectrum is at the desired frequency. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR870001320A 1986-02-18 1987-02-18 Optical Fiber Devices and Methods for Spectral Analysis and Filtering KR870008199A (en)

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Publication number Publication date
EP0233748A3 (en) 1990-01-03
NO870608D0 (en) 1987-02-17
AU6885887A (en) 1987-08-20
JPS62254020A (en) 1987-11-05
IL81506A0 (en) 1987-09-16
EP0233748A2 (en) 1987-08-26
NO870608L (en) 1987-08-19
US4781425A (en) 1988-11-01

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